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Theoretical calculations were made to find the optimum spectra for 40-watt cool white, white, warm white, and daylight fluorescent lamps. The optimization technique used is that of nonlinear mathematical programming which requires no a priori assumption on the shape of the spectral power distribution. The results show that emission in just four narrow bands is sufficient to give a color rendering index of up to 95.
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Wolfgang Walter (1978) studied this question.
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